Mastery by Robert Greene
You must allow everyone the right to exist in accordance with the character he has, whatever it turns out to be: and all you should strive to do is to make use of this character in such a way as its kind of nature permits, rather than to hope for any alteration in it, or to condemn it offhand for what it is. This is the true sense of the maxim—Live and let live…. To become indignant at [people’s] conduct is as foolish as to be angry with a stone because it rolls into your path. And with many people the wisest thing you can do, is to resolve to make use of those whom you cannot alter.